1 Filing Information Filed by Calix, Inc. Commission File No. 001-34674 Pursuant to Rule 425 Under the Securities Act of 1933 And Deemed Filed Pursuant to Rule 14a-12 Under the Securities Exchange Act of 1934 Subject Company: Occam Networks, Inc. Commission File No. 001-33069 This filing relates to the proposed acquisition by Calix, Inc, a Delaware corporation (“Calix”), of Occam Networks, Inc., a Delaware corporation (“Occam Networks”), pursuant to the terms of that certain Agreement and Plan of Merger and Reorganization, dated as of September 16, 2010, by and among Calix, Ocean Sub I, Inc., Ocean Sub II, LLC and Occam Networks.

Calix / Occam Networks “Q&A” Webinar Service Provider Overview The webinar will begin at: 11:00 AM Pacific 12:00 PM Mountain 1:00 PM Central 2:00 PM Eastern Join the teleconference now Phone: (877) 413-4220 International: (650) 227-3370 Passcode: 282 128 6509

Calix / Occam Networks “Q&A” Webinar Service Provider Overview Join the teleconference now Phone: (877) 413-4220 International: (650) 227-3370 Passcode: 282 128 6509 The webinar will begin in approximately: 5 minutes

Calix / Occam Networks “Q&A” Webinar Service Provider Overview Join the teleconference now Phone: (877) 413-4220 International: (650) 227-3370 Passcode: 282 128 6509 The webinar will begin in approximately: 4 minutes

Calix / Occam Networks “Q&A” Webinar Service Provider Overview Join the teleconference now Phone: (877) 413-4220 International: (650) 227-3370 Passcode: 282 128 6509 The webinar will begin in approximately: 3 minutes

Calix / Occam Networks “Q&A” Webinar Service Provider Overview Join the teleconference now Phone: (877) 413-4220 International: (650) 227-3370 Passcode: 282 128 6509 The webinar will begin in approximately: 2 minutes

Calix / Occam Networks “Q&A” Webinar Service Provider Overview Join the teleconference now Phone: (877) 413-4220 International: (650) 227-3370 Passcode: 282 128 6509 The webinar will begin in approximately: 1 minute

Calix / Occam Networks “Q&A” Webinar Service Provider Overview Join the teleconference now Phone: (877) 413-4220 International: (650) 227-3370 Passcode: 282 128 6509

9 Welcome and Logistics Welcome to the Calix / Occam Networks “Q&A” Webinar Hosted by Carl Russo, Calix president and CEO Short presentation describing the transaction, rationale, and benefits Questions and Answers submitted by attendees (online) Duration: 1 hour How to ask questions Conference bridge is broadcast for attendees to prevent excess noise, complexity Webinar control panel has Q&A module Type questions at anytime - monitored by Calix personnel Questions will be placed in queue for verbal Q&A response section Presenters may answer questions during the presentations if time allows

10 Transaction Overview Deal Size: Deal Size: $171 million in stock and cash Closing Conditions: Closing Conditions: Occam Networks stockholder approval, regulatory clearance and other customary closing conditions Anticipated Closing: Anticipated Closing: Q4 2010 or Q1 2011 Post Closing Metrics: Post Closing Metrics: Trailing Revenues (last 12 months): ~$350 million Estimated Customers: 800+ Aggregate Port Shipments: 10 million+ Aggregate Subscriber Lines (Customers): 48 million+

11 Key Benefits Summary: Acceleration Calix / Occam Networks combination is focused on helping our customers SUCCEED SUCCEED Accelerating Unified Access Complementary expertise expected to speed product INNOVATION INNOVATION An EXPANDED EXPANDED UNIFIED UNIFIED ACCESS ACCESS portfolio Increased resources, scale, and FOCUS FOCUS ON ON ACCESS ACCESS lays the foundation for enhanced solutions development, testing, and quality Accelerating Our Customers’ Success A WIDER WIDER RANGE RANGE OF OF DEPLOYMENT DEPLOYMENT OPTIONS OPTIONS expected from an expanded Unified Access portfolio CLOSER RELATIONSHIPS CLOSER RELATIONSHIPS with customers and partners expected through direct and expanded sales coverage and support Enhanced ALIGNMENT ALIGNMENT with communications service provider network and business model transformation

12 Key Benefits Summary: Solutions A broader Unified Access portfolio Greater breadth and diversity of solutions expected Complementary technologies allow for speedy synergies Share many common hardware and software components and attributes thereby facilitating integration into Unified Access Occam’s decade of experience in IP and Ethernet matched with Calix’s decade of experience in fiber access Enhanced voice flexibility expected A range of solutions across TDM, SIP, H.248 and MGCP New innovations expected Expanded engineering, test resources, and R&D dollars solely focused on access innovation An ENHANCED ENHANCED portfolio of options to make you more competitive

13 Key Benefits Summary: Business A focus on access Expanded resources, testing, and investment are planned in the part of your network that connects you to your customers An enhanced direct customer engagement model More “feet on the street” Expansion of our world-class support organization and tools Expanded Interoperability Combined Calix Compatible and OPAN programs create one of the industry’s broadest and most mature programs for partner interoperability. Expanded resources and a clear business vision aligned with your network and business interests to help YOU SUCCEED SUCCEED

14 Two Broadband Access Portfolios OccamView EMS BLC 6000 Chassis: high density BLC 6000 Chassis: medium, low density ONT portfolio

15 One Unified Access Portfolio Management / Value Added Software Central Office Remote Terminal / Node Premises

The Calix Commitment

The Calix Commitment Past Behaviors Predict Future Behaviors

18 2009 2010 2017 F5 support expires F5 development discontinued F5 manufacturing discontinued OSI Case Study When we acquired OSI … the following actions were taken FiberDrive: Calix continues manufacturing, MD in 2008, SD in 2015 F5: Completed roadmap, DD in 2009, MD in 2010, SD in 2017 500 ONT family: DD in 2009, MD in 2010, SD in 2015 (2017 for 560 ONTs) What we learned Have roadmap plans finalized on “day one” FiberDrive 2006 2008 2015 FiberDrive support expires FiberDrive manufacturing discontinued OSI acquired

Calix Unified Access Roadmap The Plan for Integration

20 Expanding the Unified Access Portfolio

21 EXA Powered Access Network Routed Core Network 100GE / 40GE / DWDM Rings Central Office 10GE / NxGE / GE Rings Node NxGE / GE Rings or Pt-to-Pt Remote Terminal 10GE / NxGE / GE Rings Customer, Business, or MDU Premises PON, Pt-to-Pt GE / AE, or DSL Unified Access Management Service Delivery and Assurance Fiber: MEF Services Copper: DSL / POTS Copper: DSL / POTS Fiber: PON and Pt-to-Pt GE / AE Fiber: MEF Services ETHERNET 10GE / GE Ring 10GE NxGE GE IPTV Voice Internet Access Broadcast Video MEF Services Residential Schools / Library MDU / MTU Small Business Large Business Mobile Backhaul Copper: DSL / POTS B-Series B-Series Copper: DSL / POTS Fiber: MEF Services 10GE NxGE GE SIP H.248 MGCP TDM RF RFOG

22 A Solution for Every Need Multiservice Copper | Fiber Multiprotocol Evolutionary C7 Evolutionary “B” Multiservice Copper | Fiber Ethernet Revolutionary E7 IP services Fiber Ethernet Same ONTs Managed by CMS Same Rings

23 2010 User Group Conference Agenda: 2010 User Group Conference November 6 thru 9 - just before TelcoTV Saturday 11/6: Golf Sunday 11/7: Training / Reception Monday 11/8: Keynotes / Breakouts New product introductions Possibilities of an All-Video World: Sr. execs from Cisco, Fox, Microsoft, Motorola Future of voice: Genband/Metaswitch CEOs Special event: La Reve Tuesday 11/9: Keynotes / Breakouts Unified Access vision Regulatory: Q&A with RUS Administrator Jonathan Adelstein Giveaways / Prizes Visit the Calix home page or website to register: http://usergroup.calix.com/2010/ th th

24 Add’l Information: Where to Find It Calix will file a Registration Statement on Form S-4 containing a proxy statement/prospectus and other documents concerning the proposed acquisition with the Securities and Exchange Commission (the “SEC”). Investors are urged to read the proxy statement/prospectus when it becomes available and other relevant documents filed with the SEC because they will contain important information. Security holders may obtain a free copy of the proxy statement/prospectus (when it is available) and other documents filed by Calix and Occam Networks with the SEC at the SEC’s web site at http://www.sec.gov. The proxy statement/prospectus and other documents may also be obtained for free by contacting Calix Investor Relations by e-mail at Carolyn.Bass@Calix.com, by telephone at 415-445-3232 or by mail at Investor Relations, Calix, Inc., 1035 N. McDowell Blvd., Petaluma, CA 94954 or by contacting Occam Networks Investor Relations by e-mail at ir@occamnetworks.com, by telephone at 805-692-2957or by mail at Investor Relations, Occam Networks, 6868 Cortona Drive, Santa Barbara, CA 93117.

25 Participants in the Acquisition of Occam Networks Calix, Occam Networks, certain of their respective directors, executive officers, members of management and employees may, under the rules of the SEC, may be deemed to be participants in the solicitation of proxies in favor of the proposed merger. Information regarding the persons who may be considered “participants” in the solicitation of proxies will be set forth in Calix’s proxy statement/prospectus when it is filed with the SEC. Information regarding certain of these persons and their beneficial ownership of Calix common stock as of December 31, 2009 is also set forth in the prospectus filed by Calix on March 24, 2010 with the SEC. This document is available free of charge at the SEC’s web site at www.sec.gov or by going to Calix’s Investor Relations page on its corporate website at www.Calix.com. Information concerning Occam Networks' directors and executive officers is set forth in Occam Networks' proxy statement for its 2010 Annual Meeting of Stockholders, which was filed with the SEC on April 8, 2010. This document is available free of charge at the SEC’s website at www.sec.gov or by going to Occam Networks' Investor Relations page on its corporate web site at www.OccamNetworks.com. Additional information regarding the persons who may, under the rules of the SEC, be deemed participants in the solicitation of proxies in connection with the proposed merger, and a description of their direct and indirect interests in the proposed merger, which may differ from the interests of Calix stockholders or Occam Networks stockholders generally will be set forth in the proxy statement/prospectus when it is filed with the SEC.

26 Forward Looking Statements This document contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934. These statements can be identified by the words, “believes,” “expects,” “could,” “will,” “intends,” “should,” “estimate,” “would,” “may,” “anticipates,” “plans” and other similar words. These statements are based on management’s current expectations, estimates, forecasts, projections and beliefs and are subject to a number of factors and uncertainties that could cause actual results to differ materially from those described in the forward- looking statements. The forward-looking statements contained in this document include statements about the timing of closing the acquisition, future financial and operating results; benefits of the acquisition; financial advantages; the ability to integrate the companies; the ability to expand the Unified Access portfolio; the ability to accelerate access innovation; the ability to integrate platforms and products to accelerate opportunities for customers and broaden the Calix Unified Access portfolio; plans to increase sales and support coverage; plans regarding the product roadmap; ability to enhance solutions development, testing and quality; the ability to increase the range of deployment options, create closer relationships with customers and partners and enhance alignment with communication service provider networks and business model transformations; the ability to expand resources, testing and investments; the ability to enhance the customer engagement model and expand interoperability; and other statements regarding the proposed acquisition. These statements are not guarantees of future performance, involve risks, uncertainties and assumptions that are difficult to predict, and are based upon assumptions as to future events that may not prove accurate. Therefore, actual outcomes and results may differ materially from what is expressed herein. For example, if Occam Networks does not receive required stockholder approval or the parties fail to satisfy other conditions to closing, the transaction may not be consummated. In any forward-looking statement in which Calix or Occam Networks expresses an expectation or belief as to future results, such expectation or belief is expressed in good faith and believed to have a reasonable basis, but there can be no assurance that the statement or expectation or belief will result or be achieved or accomplished. The following factors, among others, could cause actual results to differ materially from those described in the forward-looking statements: failure of the Occam Networks stockholders to approve the proposed acquisition; the challenges and costs of closing, integrating, restructuring and achieving anticipated synergies; the ability to retain key employees; and other economic, business, competitive, and/or regulatory factors affecting the businesses of Calix and Occam Networks generally, including those set forth in the filings of Calix with the Securities and Exchange Commission, especially in the “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” sections of Calix’s prospectus filed with the SEC on March 24, 2010 and its quarterly reports on Form 10-Q, Occam Networks' annual reports on Form 10-K and quarterly reports on Form 10-Q, each of Calix’s and Occam Networks' current reports on Form 8-K and other SEC filings. These forward-looking statements speak only as of the date hereof. Calix and Occam Networks are under no obligation to (and expressly disclaim any such obligation to) update or alter their forward-looking statements whether as a result of new information, future events, or otherwise.